Féileacán Cú

On 6 May 2025, Féileacán Cú first introduced himself as Cú. He revealed the official design of his fan mascot, the Pupals, on 1 June, and on 15 June anounced Cub, Ewe, and Widow, the children of Caisleán as the first characters of his upcoming novel Metamorphosis Lost.

On 21 June 2025, ANIME Impulse announced Féileacán Cú as a guest for ANIME Impulse OC 2025.

On 3 August 2025, Féileacán Cú posted the teaser "The Ultimate End" to his Youtube channel, revealing his debut date of 1 September 2025.

On 1 September 2025, Féileacán Cú made his official debut on YouTube.

His official ending theme by, "What You Mean to Me" by Laura Shigihara, was released shortly after the debut program. The song was written many years ago, but only arranged and produced shortly before Cú's debut. Laura Shigihara stated, that she allowed Féileacán Cú to use her song as his ending theme for his livestreams. The MV is based on his characters and story Metamorphosis Lost.

• Cú's fans are called Pupals, a portmanteau of pupil, pal, pup and pupa.
• His membership is called "Schuularship" as a reference to Cú being a teacher.
• His donations are called "Feillowance" as a play on the word allowance.

• Féileacán and Cú are two different individuals sharing one body. Felly is a potentially extradimensional individual that reaps lost souls and uses Cú as a vessel, while Cú is a 33 year old primary teacher that used to be a professional swimmer.

• Likes: ** Cú: Escapism, sleeping, exercise and learning. ** Féileacán: Doing his job, silence, banana flavoured food (not actual bananas though, just cheap banana cream pie, milkshakes and the like). * Dislikes: ** Cú: Crowds/groups, puzzles, competition, graphic design. ** Féileacán: People who won't shut up, people who ask too many questions, people who can't take a hint, Cú.